Another Ida71 Question

Packhorse · 23rd June 2008, 01:35

Quote: (Originally Posted by Dave Sutton)

The square scrubber does have twice the dwell time of the gas on the 'sorb.

Dave

.

Does it?

I understand the path length is twice as long but its half as wide so the gas will flow thru at twice the speed meaning it spends the same amount of time in the scrubber (+/- due to the size diffrence). What am I missing?

Am I right in thinking having 2 CLs will help reduce the problems associated with a single scrubber? eg increasing dwell time?

montyg · 23rd June 2008, 05:40

Quote: (Originally Posted by GKAM)

However if I were to build the IDA again, I would keep the two scrubbers and use a 1-1.5 L tank for O2 where the original russian tank sits. The DIL would then come from a sidemount S40 that also carries my bailout.
/GKAM

We've done about 5 x IDA-71 conversions here in SA and have found 2 liter steel tanks for on-board O2 which fit in the chassis nicely without encroaching on the counterlung, and still allows us to have the DS4 first stages inside the case. Only the tank valve handwheel sticks out and requires some of the case to be cut away.

rgds
monty

GKAM · 23rd June 2008, 07:45

Quote: (Originally Posted by montyg)

We've done about 5 x IDA-71 conversions here in SA and have found 2 liter steel tanks for on-board O2 which fit in the chassis nicely without encroaching on the counterlung, and still allows us to have the DS4 first stages inside the case. Only the tank valve handwheel sticks out and requires some of the case to be cut away.

Yup. I have the same setup in mine. Everything fits inside the case except the valve knobs.

/GKAM

robertfondren · 24th June 2008, 04:43

Guys,
Again, this is EXACTLY the sort of information for which I'm searching!
I may go with the fully modular system ala Sutton, and make the O2 tank the only permanent onboard. That awful feeling of impending doom, and the shortness of breath fron Hypercapnia are disconcerting at best, debhilitating at worst!

s. McWilliam · 11th August 2008, 23:44

I actually found a use for the original valve/first stage that came with the 71, Actually just about all the IDA AKA valves. If anyone has the original, valves or valves and cylinders collecting dust, After doing a conversion I would be interested in purchasing them. Email me at smcwilliam@sympatico.ca

thanks
Scottat

osiris · 12th August 2008, 06:22

Quote: (Originally Posted by s. McWilliam)

I actually found a use for the original valve/first stage that came with the 71, Actually just about all the IDA AKA valves. If anyone has the original, valves or valves and cylinders collecting dust, After doing a conversion I would be interested in purchasing them. Email me at smcwilliam@sympatico.ca

thanks
Scottat

A plan so cunning you could put a tail on it and call it Helen Clark. There's something not quite right with this request, I just can't put my finger on it......
Are you going to tell or do we send in the storm troopers?

Actually, I found a use for a couple of valves as well - converted them to adaptors so I could get the tanks hydro'd.

s. McWilliam · 14th August 2008, 22:09

Well I had a hang nail once and it hurt so much I can not even envision baboo under the fingernails, so I do not mind spilling the beans. I lucked out on a few two litre 3000 psi steel cylinders that have the same thread as the Russian cylinders. They are one inch larger in circumference than the cylinders in a 72 but they will fit. Every thing else has to be modified. So, depending on were you live they could be a good deal. They are DOT (the US) and TC (transport Canada) certified. So, once you get over the thread taper problem (I chopped one to get mine hydroed to) you can use the Russian valve first stage that came with the unit for the conversion. I have a few spares and can make them available with a hydro, VIP, and O2 ready to anyone who needs them at basically a dirt cheep price. That is you would be paying for the hydro, shipping and a couple of bucks for paint and cleaning. That`s the big mystery lol.
Scott

osiris · 15th August 2008, 00:49

Quote: (Originally Posted by s. McWilliam)

Well I had a hang nail once and it hurt so much I can not even envision baboo under the fingernails, so I do not mind spilling the beans. I lucked out on a few two litre 3000 psi steel cylinders that have the same thread as the Russian cylinders. They are one inch larger in circumference than the cylinders in a 72 but they will fit. Every thing else has to be modified. So, depending on were you live they could be a good deal. They are DOT (the US) and TC (transport Canada) certified. So, once you get over the thread taper problem (I chopped one to get mine hydroed to) you can use the Russian valve first stage that came with the unit for the conversion. I have a few spares and can make them available with a hydro, VIP, and O2 ready to anyone who needs them at basically a dirt cheep price. That is you would be paying for the hydro, shipping and a couple of bucks for paint and cleaning. That`s the big mystery lol.
Scott

Well, after buying my Rbs I couln't afford the storm troopers anyway!

. The cylinders sound good - have you looked at the valves on tecme.de? They have the PA valves look alikes there in Klienkonisch - the russki one's tend to be a bit marmalised by the time I get them out I have found.

s. McWilliam · 15th August 2008, 13:19

Thanks for the tip I will check that out. I would prefer a little more sophisticated first stage anyway.
Scott McWilliam

23rd June 2008, 01:35	#11 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 103	Re: Another Ida71 Question Quote: (Originally Posted by Dave Sutton) The square scrubber does have twice the dwell time of the gas on the 'sorb. Dave . Does it? I understand the path length is twice as long but its half as wide so the gas will flow thru at twice the speed meaning it spends the same amount of time in the scrubber (+/- due to the size diffrence). What am I missing? Am I right in thinking having 2 CLs will help reduce the problems associated with a single scrubber? eg increasing dwell time? __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
(Offline)

23rd June 2008, 05:40	#12 (permalink)
montyg Monty Guest Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Feb 2007 Location: Cape Town, South Africa Posts: 229	Re: Another Ida71 Question Quote: (Originally Posted by GKAM) However if I were to build the IDA again, I would keep the two scrubbers and use a 1-1.5 L tank for O2 where the original russian tank sits. The DIL would then come from a sidemount S40 that also carries my bailout. /GKAM We've done about 5 x IDA-71 conversions here in SA and have found 2 liter steel tanks for on-board O2 which fit in the chassis nicely without encroaching on the counterlung, and still allows us to have the DS4 first stages inside the case. Only the tank valve handwheel sticks out and requires some of the case to be cut away. rgds monty
(Offline)

23rd June 2008, 07:45	#13 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 252	Re: Another Ida71 Question Quote: (Originally Posted by montyg) We've done about 5 x IDA-71 conversions here in SA and have found 2 liter steel tanks for on-board O2 which fit in the chassis nicely without encroaching on the counterlung, and still allows us to have the DS4 first stages inside the case. Only the tank valve handwheel sticks out and requires some of the case to be cut away. Yup. I have the same setup in mine. Everything fits inside the case except the valve knobs. /GKAM __________________ Stay #
(Offline)

24th June 2008, 04:43	#14 (permalink)
robertfondren New Member Current Rebreather/s: Ray Other Rebreather/s: Not Bought Yet Ray Join Date: Mar 2006 Location: u.s.a. Posts: 79	Re: Another Ida71 Question Guys, Again, this is EXACTLY the sort of information for which I'm searching! I may go with the fully modular system ala Sutton, and make the O2 tank the only permanent onboard. That awful feeling of impending doom, and the shortness of breath fron Hypercapnia are disconcerting at best, debhilitating at worst!
(Offline)

11th August 2008, 23:44	#15 (permalink)
s. McWilliam New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2008 Location: Canada Posts: 15	Re: Another Ida71 Question I actually found a use for the original valve/first stage that came with the 71, Actually just about all the IDA AKA valves. If anyone has the original, valves or valves and cylinders collecting dust, After doing a conversion I would be interested in purchasing them. Email me at smcwilliam@sympatico.ca thanks Scottat Last edited by s. McWilliam : 11th August 2008 at 23:48. Reason: second thought
(Offline)

12th August 2008, 06:22	#16 (permalink)
osiris Custom Title Allowed! Current Rebreather/s: Inspiration Classic Sport Kiss Home Build Other Rebreather/s: Home Build Join Date: Feb 2006 Location: Auckland Posts: 320	Re: Another Ida71 Question Quote: (Originally Posted by s. McWilliam) I actually found a use for the original valve/first stage that came with the 71, Actually just about all the IDA AKA valves. If anyone has the original, valves or valves and cylinders collecting dust, After doing a conversion I would be interested in purchasing them. Email me at smcwilliam@sympatico.ca thanks Scottat A plan so cunning you could put a tail on it and call it Helen Clark. There's something not quite right with this request, I just can't put my finger on it...... Are you going to tell or do we send in the storm troopers? Actually, I found a use for a couple of valves as well - converted them to adaptors so I could get the tanks hydro'd. Last edited by osiris : 12th August 2008 at 06:25.
(Offline)

14th August 2008, 22:09	#17 (permalink)
s. McWilliam New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2008 Location: Canada Posts: 15	Re: Another Ida71 Question Well I had a hang nail once and it hurt so much I can not even envision baboo under the fingernails, so I do not mind spilling the beans. I lucked out on a few two litre 3000 psi steel cylinders that have the same thread as the Russian cylinders. They are one inch larger in circumference than the cylinders in a 72 but they will fit. Every thing else has to be modified. So, depending on were you live they could be a good deal. They are DOT (the US) and TC (transport Canada) certified. So, once you get over the thread taper problem (I chopped one to get mine hydroed to) you can use the Russian valve first stage that came with the unit for the conversion. I have a few spares and can make them available with a hydro, VIP, and O2 ready to anyone who needs them at basically a dirt cheep price. That is you would be paying for the hydro, shipping and a couple of bucks for paint and cleaning. That`s the big mystery lol. Scott
(Offline)

15th August 2008, 00:49	#18 (permalink)
osiris Custom Title Allowed! Current Rebreather/s: Inspiration Classic Sport Kiss Home Build Other Rebreather/s: Home Build Join Date: Feb 2006 Location: Auckland Posts: 320	Re: Another Ida71 Question Quote: (Originally Posted by s. McWilliam) Well I had a hang nail once and it hurt so much I can not even envision baboo under the fingernails, so I do not mind spilling the beans. I lucked out on a few two litre 3000 psi steel cylinders that have the same thread as the Russian cylinders. They are one inch larger in circumference than the cylinders in a 72 but they will fit. Every thing else has to be modified. So, depending on were you live they could be a good deal. They are DOT (the US) and TC (transport Canada) certified. So, once you get over the thread taper problem (I chopped one to get mine hydroed to) you can use the Russian valve first stage that came with the unit for the conversion. I have a few spares and can make them available with a hydro, VIP, and O2 ready to anyone who needs them at basically a dirt cheep price. That is you would be paying for the hydro, shipping and a couple of bucks for paint and cleaning. That`s the big mystery lol. Scott Well, after buying my Rbs I couln't afford the storm troopers anyway!. The cylinders sound good - have you looked at the valves on tecme.de? They have the PA valves look alikes there in Klienkonisch - the russki one's tend to be a bit marmalised by the time I get them out I have found.
(Offline)

15th August 2008, 13:19	#19 (permalink)
s. McWilliam New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2008 Location: Canada Posts: 15	Re: Another Ida71 Question Thanks for the tip I will check that out. I would prefer a little more sophisticated first stage anyway. Scott McWilliam
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode